Smoother Android Movement with deltaPosition

I'm using this code to move me around smoothly on a vertical shooter

 if (Input.touchCount >=1 && Input.GetTouch(0).phase == TouchPhase.Moved) {
             Vector2 touchDeltaPosition = Input.GetTouch(0).deltaPosition;
             transform.Translate(touchDeltaPosition.x * speed*Time.deltaTime, touchDeltaPosition.y * speed*Time.deltaTime, 0);
     }

I've been playing with the speed parameter, and I can get it fairly manageable to control, but it still seems very... Jumpy. Can you suggest anything that might smooth it out?